After using my Hexar AF for a few days with 100 to 3200 film, with and without NDs (and other filters), both on harsh and soft light, I think now I understand why some people can't get along with it: just because they're fools! Just kidding... Now, seriously: As I said before, I bought the camera for low light situations where focusing is hard/impossible. I wasn't wrong with my choice, and I'm so very pleased there. It's an unusual camera, though... I really see it can fool some people, and it can (must) be used in very different ways:
A planned session camera... You want half body portraits with a nice 35 wide open, you want beautiful bokeh, and this time you just don't want to focus, and you don't want to wind film, just interact and “work” your subject. Then the Hexar AF is your tool. How is it used then? Depending on the light you decide for the session, you choose a film that's OK for your lens at around 2.8, and that's it. In case light changes a bit, automatic shutter speeds for your desired aperture will allow you to forget about technical details and use your time for aesthetic ones only, so you keep shooting, and forget about light. Your subject will be with you all the time, and won't be disturbed by size or noise.
Street shooting on a sunny day... You pick slow film if you prefer wide apertures (or not so slow and filters, as I did with 3200 on direct sun at f/2), set your aperture, and just shoot. Even in manual mode, as the light will be the same.
Street shooting on overcast... You set your camera on P, with say Tri-X at 400. You already know if you have all the overcast light on a scene, you'll be at around 1/250 f/8. So you set a medium aperture, and depending on the light, the camera will change speeds and/or apertures to make your settings fall between its max. shutter speed (1/250) and the min. shutter speed you like (1/60 in my case). This mode gives you an amazing range of different quantities of light you can handle... More than eight stops! From bright overcast to places where that light doesn't reach totally and scenes' light is really lower. All that, without thinking of your camera or touching it to vary settings as usual with other cameras... So you can easily go from good light to dark places quickly, and you don't miss shots focusing or metering or changing settings.
Now, I see why some people can feel upset with the Hexar AF. Because they might want to do all this at the same time with the same film, whenever they want to, and that's just not possible: it was designed for a photographer that's used to know what's the light every moment, and that's why the camera works with a narrow set of “no shake speeds”... I use 1/60, 1/125 and 1/250, no more, so I need to use them the same way I use just one speed/aperture with any manual camera to expose correctly. Although the Hexar AF can do all those different things in such different lights and situations, it can't do all of them in auto at the same time without adjusting a few things... That's why I guess it disturbs some people: if they're in the shadows, then direct sun can be too much for the camera and you need precise filtering (most people don't even use NDs) so it can't be done (unless you know how to do it...), or if you want f/2 suddenly, you can't do it because 1/250 is not enough: and what I mean is you can't just place an ND and forget about light, no, you need to know the precise light you have because your camera has just a few usable shutter speeds...
So, this isn't really a point-and-shoot... This is a camera that requires a lot from the photographer, so it's not for everyone.
For normal shooting I'm using my R3A with my 28 3.5 on, prefucused at 8 feet and at f/8: small, quiet and fast, reliable for 80% of the scenes I get walking the streets. If the other side of the street is sunny, I aim and shoot with my XA at f/11 prefocused at 8 feet too, for a very different development. And if the light is really low and no film gives me f/8 to avoid focusing, and I see my R3A gives me low speeds at f/8, I aim and shoot with my Hexar AF set at f/2 and it does the rest...
I can't do it all with the same camera if I'm looking for vanishing moments and street shooting (people). Of course if there's time and the goal is getting an image of a building, or a landscape, and I don't care about harsh or soft light, or about good exposure and development for wet printing, any camera can be enough. They all make an image.
Cheers,
Juan